Sighting apparatus



June 20, J. c KARNES SIGHTING APPARATUS Filed Oct. 15, 1957 A S m m 2 w5 K I W. H M Y m .5 ,w/ 3.3 //%/AM,/

Attmrna Ch i 33. GEUMETRICM. YNSTRUMENTS.

Patented June 20, 1939 UNITED STATES PATENT OFFICE (Granted under theact of March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) 2 Claims.

The invention described herein may be manufactured and used by or forthe Government for governmental purposes, without the payment to me ofany royalty thereon.

been included and provide a scale indicating values of range andrepresenting by their distance from the axis of abscissas X theelevation corresponding to range which must be given to the 5 Thisinvention relates to a sighting apparatus gun. The optical axis of O ofthe instrument is 5' intended primarily for use with guns. maintainedparallel to the axis of the bore of The sighting apparatus of my priorPatent No. the gun. The electrical circuit 9 includes a se- 1,708,389 ofApril 9, 1929, proposes a system of lector switch It).

wires or a t le n a, glass in an optical in- In Fig. 3-there has beenadded to the showing 10 strument in which intersecting wires or linesrepf F g. 2 a corresponding system of vertically 10 resent ranges andspeeds or lateral travel of a disposed wires F optically intersectingthe horitarget and interpret corresponding values of elezontal wires Eand each connected to the wire vation and deflection which must be giventhe X which has only one end connected to the wires gun. These linesappear black and frequently the E. The wires F represent by theirdistance from nature of the landscape or background and parthe axis ofordinates Y the lead or deflection cor- 15 ticular conditions of lightand shadow produce r spondin t t spe d f a ta t which must situations inwhich the lines are not visible with be applied to the gun to compensatefor the travel suflicient distinctness and clarity. of e target ng thetime required to cal- The purpose of this invention is to provide a3u1ate data and the time of flight of the prosighting apparatus in whichthe wires representjectile. Since the horizontal lead varies prO- 20 ingrange and deflection may be rendered incanportionally to range the speedlines F are indescent so as to insure their visibility and by l ned t0 eax s being p otted as a function selective illumination to particularlyindicate the of apparent speed of a target and time of flightintersection t t is t b d, of the projectile. The speed lines aregraduated This arrangement also lends itself readily for on theassumption of a. target traveling at right 25 the indication of data andthe provision of an angles to the normal plane of fire of the gun soinexpensive and practically instantaneous data that in selecting a speedline the apparent speed transmission system which is noiseless, which ofthe target as resulting from the angle of apdoes not require adjustmentand which does not proach is the value employed.

include moving parts. Both the horizontal and vertical wires are 30 Tothese and other ends, the invention consists placed in an electricalcircuit II including a in the construction, arrangement andcombinaswitch l2 for range and a switch [3 for deflection. tion ofelements described hereinafter and point- These switches may b situatedat a remote coned out in the claims forming a part of this specitrolstation where the firing data is determined. fication. The gunner merelykeeps the announced target 35 A practical embodiment of the invention ison the incandescent wire or on the intersection illustrated in theaccompanying drawing, whereof the incandescent Wires. Since the wires Fand. the lower part of wire Y are each connected to Fig. 1 is a view inelevation of a reticle glass Wire X, the Wire X will be illuminated whenthe showing an arrangement for illuminating the Switch I3 is 011 y OneOf the o tacts. 40

crosswires. Although it is preferred to provide the wires Fig. 2 is asimilar view of a reticle glass having as a reticle on the glass in anoptical instrument a plurality of wires representing range. they may bemade of metal and mounted on the Fig. 3 is a similar view showing wiresfor both gun in t e S manner as a from; sightrange and deflection. Iclaim: 45

Referring to Fig. 1 there is shown a glass plate 1. In a sightingapparatus, a horizintal and a 5 adapted to form an element of an opticalinvertical wire forming axes of coordinates, a plustrument. The opticalaxis 0 of the instrument rality of substantially vertically arrangeddeflecis indicated by the intersection or origin of a tion wiresconnected to the horizontal axis wire horizontal line X and a verticalline Y. These and representing by their distance from the ver- 50 linesare provided by wires which are in extical axis wire a value ofdeflection to be applied hausted cells or moulded in the plate 5. The toa gun, a plurality of horizontally arranged wires are placed in anelectrical circuit 6, includrange wires optically intersecting thevertical ing a rheostat I and a switch 8. Wires and connected to one endof the horizontal In Fig. 2 a plurality of horizontal wires E have axiswire, said horizontal wires representing by 55 their distance from thehorizontal axis wire a 'value of range to be applied to a gun, all ofsaid wires connected in circuit, a switch for controlling incandescenceof a selected one of the horizontal range wires and a switch forcontrolling incandescence of a selected one of the vertical deflectionwires.

2. In a sighting apparatus, an arrangement of spaced wires one of whichrepresents an origin and the others of which represent by their distancefrom the origin wire data to be applied to a gun, an electrical circuitcontaining the wires, and a switch in said circuit for controllingincandescence of any selected one of said wires.

J AlVIES C. KARNES.

